out of the window

out (of) the window

Forgotten or disregarded; lost or wasted. One member of the audience started shouting at the speaker during the presentation, and all sense of decorum went right out of the window. Once the government deregulated the industry, expensive safety precautions were the first thing out the window.
See also: out, window
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

out of the window

Discarded, tossed out. This term is often used in the phrase go out the window, as in For the town planners past experience seems to have gone out the window. It alludes to unwanted items being hurled out of the window. [First half of 1900s]
See also: of, out, window
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
See also:
References in classic literature ?
"Chuck that cheese slicer out of the window," he said, "and tell 'em inside that Mr.
When the guard was called away the prisoner had apparently left his cell, and climbed out of the window and over a wall.
A friend who came with us said, 'Another of my prejudices has gone out of the window!'